caa a22 4500 606226842 CHVBK 20210128101155.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10641-014-0256-5 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0256-5 Equilibrium reproductive strategy of the armored catfish Hypostomus auroguttatus (Siluriformes, Loricariidae) in a tropical river in Southeastern Brazil [Elektronische Daten] [Iracema Gomes, Francisco Araújo, Aparecida do Nascimento, Armando Sales] We investigated the reproductive strategy developed by the armored catfish Hypostomus auroguttatus Kner 1854 in a tropical river of Southeastern Brazil. A total of 173 females (157-370mm TL) and 165 males (140-357mm TL) were analyzed. Sex ratio (1 female: 1.05 male) was well balanced. Six stages of oogenesis and five of spermatogenesis were described. Oocyte development was synchronic in two groups, with oocyte size ranging from pre-spawning (<200μm) to spawning (600-1,000μm), followed by a sharp decrease in the postspawning (200-360μm) phase. Macroscopic oocyte diameter ranged from 0.1mm to 7.2mm, with vitellogenic ones ranging from 4.8 to 7.2mm. Spawning occurred throughout most of the year, peaking in September-October. Mean batch fecundity was 411 oocytes ranging from 163 to 662 vitellogenic oocytes (relative fecundity = 2.26 oocytes g−1). These attributes, associated with parental care and a wide reproductive period, corresponded to an equilibrium strategy that has proved to be effective in this tropical river. The dominance of H. auroguttatus in rivers, compared with the congeneric Hypostomus affinis that dominates in impoundments, could be associated to larger egg size and lower fecundity in H. auroguttatus, an adaption toward equilibrium strategy that seems to be efficient to this species succeed in running waters. The hypothesis that equilibrium reproductive strategy for fish species is favored in more, predictable environments was confirmed. Springer Science+Business Media Dordrecht, 2014 Tropical fish nationallicence Fish reproduction nationallicence Reproductive strategy nationallicence Tactics nationallicence Gomes Iracema Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut Araújo Francisco Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut do Nascimento Aparecida Laboratório de Histologia e Embriologia Animal, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut Sales Armando Laboratório de Histologia e Embriologia Animal, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 249-260 0378-1909 98:1<249 2015 98 10641 https://doi.org/10.1007/s10641-014-0256-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0256-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gomes Iracema Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- Araújo Francisco Laboratório de Ecologia de Peixes, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- do Nascimento Aparecida Laboratório de Histologia e Embriologia Animal, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- Sales Armando Laboratório de Histologia e Embriologia Animal, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, 23, 890-000, Seropédica, Rio de Janeiro, Brazil aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 249-260 0378-1909 98:1<249 2015 98 10641